KOPA Insecticidal Soap (47% potassium salts of fatty acids) is a natural insecticide, fungicide, and miticide. KOPA is effective on larval, nymph and adult life stages of insect pests. It works on contact by breaking down the protective cuticle and penetrating the body of target insects and mites. As a disease prevention, KOPA works by smothering disease-causing fungal spores and creating a protective barrier on plant surfaces. There are no residual effects after drying. Do not mix KOPA with sulfur.